timeformiller44

Finally put the car on the road after a long time.

have ported and polished heads, with full exhaust, JLT CAI, SCT livewire. not to much

Was getting lean codes. bank 1 and 2, checked fuel pressure, was ####, so replaced the pump with a Ford GT 255lph pump. wired it in and such, now at Higher RPMS, i lose fuel, big time, like 10psi at 5300rpm, also corraltes with the voltage higher voltages, less fuel pressure, i have it datalogged if anyone wants to see it, i can send the file, i am clueless, i know there are no kinked lines anywhere, checked multiple times, newer filter. and i doubt its in the tune for something so drastic of a drop in pressure.

either new pump is failing, or i have the wiring backwards and the polarity is killing pressure when seeing voltage spike.

but my car should be running fast than a 9 in the 1/8 because it has before, now i am running 10's and slower.......

school boy

It sounds fuel pump related. Might try and replace it. If the wires were reversed, you would have no pressure.

timeformiller44

damn pump wasnt cheap and its newer.. UGH

school boy

Might try and see if youre receiving full voltage at the pump somehow while driving.

Phillip123

Maybe its a bad coil.